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Finding the Fourth Proportional to 355.74, 490.95 and 282.66

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Solution

The fourth proportional to 355.74, 490.95 and 282.66 is: 390.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    355.74 : 490.95 = 282.66 : x
  2. Step 2: Convert to fraction form
    355.74/490.95 = 282.66/x
  3. Step 3: Cross multiply
    355.74x = 490.95 × 282.66
  4. Step 4: Simplify right side
    355.74x = 138,771.93
  5. Step 5: Solve for x
    x = 138,771.93/355.74
  6. Step 6: Final answer
    x = 390.09

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.